ArcanistBinaryNumericScalarCasingXHPASTLinterRule.php
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ArcanistBinaryNumericScalarCasingXHPASTLinterRule.php
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	<?php

	final class ArcanistBinaryNumericScalarCasingXHPASTLinterRule
	extends ArcanistXHPASTLinterRule {

	const ID = 131;

	public function getLintName() {
	return pht('Binary Integer Casing');
	}

	public function getLintSeverity() {
	return ArcanistLintSeverity::SEVERITY_WARNING;
	}

	public function process(XHPASTNode $root) {
	$binaries = $this->getBinaryNumericScalars($root);

	foreach ($binaries as $binary) {
	$value = substr($binary->getConcreteString(), 2);

	if (!preg_match('/^0b[01]+$/', $binary->getConcreteString())) {
	$this->raiseLintAtNode(
	$binary,
	pht(
	'For consistency, write binary integers with a leading `%s`.',
	'0b'),
	'0b'.$value);
	}
	}
	}

	private function getBinaryNumericScalars(XHPASTNode $root) {
	$numeric_scalars = $root->selectDescendantsOfType('n_NUMERIC_SCALAR');
	$binary_numeric_scalars = array();

	foreach ($numeric_scalars as $numeric_scalar) {
	$number = $numeric_scalar->getConcreteString();

	if (preg_match('/^0b[01]+$/i', $number)) {
	$binary_numeric_scalars[] = $numeric_scalar;
	}
	}

	return $binary_numeric_scalars;

	}

	}

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